from django.urls import reverse
from django_redis import get_redis_connection

from carts.utils import merge_carts_cookies_to_redis
from goods.models import SKU
from meiduo_mall.utils.response_code import RETCODE
from django.shortcuts import render, redirect
from django.views import View
from django import http
import re, logging, json

from meiduo_mall.utils.views import LoginRequiredJSONMixin
from .models import User, Address
from django.db import DatabaseError
from django.contrib.auth import login, logout, authenticate
from django.contrib.auth.mixins import LoginRequiredMixin
from . import constants
from celery_tasks.email.tasks import send_verify_email
from meiduo_mall.apps.users.utils import generate_verify_email_url, check_verify_email_token

# 创建日志输出器
logger = logging.getLogger('django')


class UserBrowserHistory(LoginRequiredJSONMixin, View):
    def get(self, request):
        '''
            发送post请求的时候只发送了sku_id，所以要以sku_id为核心查找商品的信息
        {
            "code": "0",
            "errmsg": "OK",
            "skus": [
                {
                    "id": 6,
                    "name": "Apple iPhone 8 Plus (A1864) 256GB 深空灰色 移动联通电信4G手机",
                    "default_image_url": "http://image.meiduo.site:8888/group1/M00/00/02/CtM3BVrRbI2ARekNAAFZsBqChgk3141998",
                    "price": "7988.00"
                },
                ......
            ]
        }
        '''
        redis_conn = get_redis_connection('histories')
        sku_ids = redis_conn.lrange('history%s' % request.user.id, 0, -1)

        skus = []
        for sku_id in sku_ids:
            sku = SKU.objects.get(id=sku_id)
            skus.append({
                'id': sku_id,
                'name': sku.name,
                'default_image_url': sku.default_image.url,
                'price': sku.price
            })
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'OK', 'skus': skus})

    def post(self, request):
        # 接收参数
        json_dict = json.loads(request.body.decode())
        sku_id = json_dict.get('sku_id')

        # 校验参数
        try:
            SKU.objects.get(id=sku_id)
        except SKU.DoesNotExist:
            http.HttpResponseNotFound('sku不存在')

        # 保存用户浏览记录
        redis_conn = get_redis_connection('history')
        pl = redis_conn.pipeline()
        user_id = request.user.id

        pl.lrem('history_%s' % user_id, 0, sku_id)
        pl.lpush('history_%s' % user_id, sku_id)
        pl.ltrim('history_%s' % user_id, 0, 4)
        pl.execute()

        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': "ok"})


class UpdateTitleAddressView(LoginRequiredJSONMixin, View):
    """更新地址标题"""

    def put(self, reqeust, address_id):
        """实现更新地址标题逻辑"""
        # 接收参数：title
        json_dict = json.loads(reqeust.body.decode())
        title = json_dict.get('title')

        # 校验参数
        if not title:
            return http.HttpResponseForbidden('缺少title')

        try:
            # 查询当前要更新标题的地址
            address = Address.objects.get(id=address_id)
            # 将新的地址标题覆盖地址标题\
            address.title = title
            address.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '更新标题失败'})

        # 响应结果
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '更新标题成功'})


class DefaultAddressView(LoginRequiredJSONMixin, View):
    """设置默认地址"""

    def put(self, reqeust, address_id):
        """实现设置默认地址逻辑"""
        try:
            # 查询出当前哪个地址会作为登录用户的默认地址
            address = Address.objects.get(id=address_id)

            # 将指定的地址设置为当前登录用户的默认地址
            reqeust.user.default_address = address
            reqeust.user.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '设置默认地址失败'})
        # 响应结果
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '设置默认地址成功'})


class UpdateDestoryAddressView(LoginRequiredJSONMixin, View):
    """更新和删除地址"""

    def put(self, request, address_id):
        """更新地址"""
        # 接收参数
        json_dict = json.loads(request.body.decode())
        receiver = json_dict.get('receiver')
        province_id = json_dict.get('province_id')
        city_id = json_dict.get('city_id')
        district_id = json_dict.get('district_id')
        place = json_dict.get('place')
        mobile = json_dict.get('mobile')
        tel = json_dict.get('tel')
        email = json_dict.get('email')

        # 校验参数
        if not all([receiver, province_id, city_id, district_id, place, mobile]):
            return http.HttpResponseForbidden('缺少必传参数')
        if not re.match(r'^1[3-9]\d{9}$', mobile):
            return http.HttpResponseForbidden('参数mobile有误')
        if tel:
            if not re.match(r'^(0[0-9]{2,3}-)?([2-9][0-9]{6,7})+(-[0-9]{1,4})?$', tel):
                return http.HttpResponseForbidden('参数tel有误')
        if email:
            if not re.match(r'^[a-z0-9][\w\.\-]*@[a-z0-9\-]+(\.[a-z]{2,5}){1,2}$', email):
                return http.HttpResponseForbidden('参数email有误')

        # 使用最新的地址信息覆盖指定的旧的地址信息
        try:
            Address.objects.filter(id=address_id).update(
                user=request.user,
                title=receiver,
                receiver=receiver,
                province_id=province_id,
                city_id=city_id,
                district_id=district_id,
                place=place,
                mobile=mobile,
                tel=tel,
                email=email
            )
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '修改地址失败'})

        # 响应新的地址信息给前端渲染
        address = Address.objects.get(id=address_id)
        address_dict = {
            "id": address.id,
            "title": address.title,
            "receiver": address.receiver,
            "province": address.province.name,
            "city": address.city.name,
            "district": address.district.name,
            "place": address.place,
            "mobile": address.mobile,
            "tel": address.tel,
            "email": address.email
        }
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '修改地址成功', 'address': address_dict})

    def delete(self, request, address_id):
        """删除地址"""
        # 实现指定地址的逻辑删除：is_delete=True
        try:
            address = Address.objects.get(id=address_id)
            address.is_deleted = True
            address.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '删除地址失败'})

        # 响应结果：code, errmsg
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '删除地址成功'})


class AddressCreateView(LoginRequiredJSONMixin, View):
    """新增地址"""

    def post(self, reqeust):
        """实现新增地址逻辑"""

        # 判断用户地址数量是否超过上限：查询当前登录用户的地址数量
        # count = Address.objects.filter(user=reqeust.user).count()
        count = reqeust.user.addresses.count()  # 一查多，使用related_name查询
        if count > constants.USER_ADDRESS_COUNTS_LIMIT:
            return http.JsonResponse({'code': RETCODE.THROTTLINGERR, 'errmsg': '超出用户地址上限'})

        # 接收参数
        json_str = reqeust.body.decode()
        json_dict = json.loads(json_str)
        receiver = json_dict.get('receiver')
        province_id = json_dict.get('province_id')
        city_id = json_dict.get('city_id')
        district_id = json_dict.get('district_id')
        place = json_dict.get('place')
        mobile = json_dict.get('mobile')
        tel = json_dict.get('tel')
        email = json_dict.get('email')

        # 校验参数
        if not all([receiver, province_id, city_id, district_id, place, mobile]):
            return http.HttpResponseForbidden('缺少必传参数')
        if not re.match(r'^1[3-9]\d{9}$', mobile):
            return http.HttpResponseForbidden('参数mobile有误')
        if tel:
            if not re.match(r'^(0[0-9]{2,3}-)?([2-9][0-9]{6,7})+(-[0-9]{1,4})?$', tel):
                return http.HttpResponseForbidden('参数tel有误')
        if email:
            if not re.match(r'^[a-z0-9][\w\.\-]*@[a-z0-9\-]+(\.[a-z]{2,5}){1,2}$', email):
                return http.HttpResponseForbidden('参数email有误')

        # 保存用户传入的地址信息
        try:
            address = Address.objects.create(
                user=reqeust.user,
                title=receiver,  # 标题默认就是收货人
                receiver=receiver,
                province_id=province_id,
                city_id=city_id,
                district_id=district_id,
                place=place,
                mobile=mobile,
                tel=tel,
                email=email,
            )

            # 如果登录用户没有默认的地址，我们需要指定默认地址
            if not reqeust.user.default_address:
                reqeust.user.default_address = address
                reqeust.user.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '新增地址失败'})

        # 构造新增地址字典数据
        address_dict = {
            "id": address.id,
            "title": address.title,
            "receiver": address.receiver,
            "province": address.province.name,
            "city": address.city.name,
            "district": address.district.name,
            "place": address.place,
            "mobile": address.mobile,
            "tel": address.tel,
            "email": address.email
        }

        # 响应新增地址结果：需要将新增的地址返回给前端渲染
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '新增地址成功', 'address': address_dict})


class AddressView(LoginRequiredMixin, View):
    """用户收货地址"""

    def get(self, request):
        """查询并展示用户地址信息"""

        # 获取当前登录用户对象
        login_user = request.user
        # 使用当前登录用户和is_deleted=False作为条件查询地址数据
        addresses = Address.objects.filter(user=login_user, is_deleted=False)

        # 将用户地址模型列表转字典列表:因为JsonResponse和Vue.js不认识模型类型，只有Django和Jinja2模板引擎认识
        address_list = []
        for address in addresses:
            address_dict = {
                "id": address.id,
                "title": address.title,
                "receiver": address.receiver,
                "province": address.province.name,
                "city": address.city.name,
                "district": address.district.name,
                "place": address.place,
                "mobile": address.mobile,
                "tel": address.tel,
                "email": address.email
            }
            address_list.append(address_dict)

        # 构造上下文
        context = {
            'default_address_id': login_user.default_address_id,
            'addresses': address_list
        }

        return render(request, 'user_center_site.html', context)


class VerifyEmailView(View):
    """验证邮箱"""

    def get(self, request):
        # 接收参数
        token = request.GET.get('token')

        # 校验参数
        if not token:
            return http.HttpResponseForbidden('缺少token')

        # 从token中提取用户信息user_id ==> user
        user = check_verify_email_token(token)
        if not user:
            return http.HttpResponseBadRequest('无效的token')

        # 将用户的email_active字段设置为True
        try:
            user.email_active = True
            user.save()
        except Exception as e:
            logger.error(e)
            return http.HttpResponseServerError('激活邮箱失败')

        # 响应结果：重定向到用户中心
        return redirect(reverse('users:info'))


class EmailView(LoginRequiredJSONMixin, View):
    """添加邮箱"""

    def put(self, request):
        # 接收参数
        json_str = request.body.decode()  # body 类型是bytes
        json_dict = json.loads(json_str)
        email = json_dict.get('email')

        # 校验参数
        if not re.match(r'^[a-z0-9][\w\.\-]*@[a-z0-9\-]+(\.[a-z]{2,5}){1,2}$', email):
            return http.HttpResponseForbidden('参数email有误')

        # 将用户传入的邮箱保存到用户数据库的email字段中
        try:
            request.user.email = email
            request.user.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '添加邮箱失败'})

        # 发送邮箱验证邮件
        verify_url = generate_verify_email_url(request.user)
        # send_verify_email(email, verify_url) # 错误的写法
        send_verify_email.delay(email, verify_url)  # 一定要记得调用delay

        # 响应结果
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'OK'})


class UserInfoView(LoginRequiredMixin, View):
    """用户中心"""

    def get(self, request):
        """提供用户中心页面"""
        # 如果LoginRequiredMixin判断出用户已登录，那么request.user就是登陆用户对象
        context = {
            'username': request.user.username,
            'mobile': request.user.mobile,
            'email': request.user.email,
            'email_active': request.user.email_active
        }
        return render(request, 'user_center_info.html', context)


class LogoutView(View):
    def get(self, request):
        logout(request)
        response = redirect(reverse('contents:index'))
        response.delete_cookie('username')
        return response


class LoginView(View):
    def get(self, request):
        return render(request, 'login.html')

    def post(self, request):
        username = request.POST.get('username')
        password = request.POST.get('password')
        remembered = request.POST.get('remembered')

        if not all([username, password]):
            return http.HttpResponseForbidden('请输入帐号名或密码')

        if not re.match(r'^[a-zA-Z0-9_-]{5,20}$', username):
            return http.HttpResponseForbidden('用户名格式错误')
        if not re.match(r'^[a-zA-Z0-9]{8,25}', password):
            return http.HttpResponseForbidden('密码格式不正确')

        user = authenticate(username=username, password=password)
        if user is None:
            return render(request, 'login.html', {'account_message': '用户名或密码错误'})

        login(request, user)  # ???

        if remembered != "on":
            request.session.set_expiry(0)
        else:
            request.session.set_expiry(None)

        next = request.GET.get('next')
        print(next)
        if next:
            response = redirect(next)
        else:
            response = redirect(reverse('contents:index'))

        response.set_cookie('username', user.username, max_age=3600 * 24 * 15)
        response = merge_carts_cookies_to_redis(request=request, user=user, response=response)

        return response


class UsernameCountView(View):
    def get(self, request, username):
        count = User.objects.filter(username=username).count()
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'OK', 'count': count})


class MobileCountView(View):
    def get(self, request, mobile):
        count = User.objects.filter(mobile=mobile).count()
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'OK', 'count': count})


class RegisterView(View):
    """用户注册"""

    def get(self, request):
        return render(request, 'register.html')

    def post(self, request):
        username = request.POST.get('username')
        password = request.POST.get('password')
        password2 = request.POST.get('password2')
        mobile = request.POST.get('mobile')
        allow = request.POST.get('allow')

        if not all([username, password, password2, mobile, allow]):
            return http.HttpResponseForbidden('缺少必传参数')
        if not re.match(r'^[a-zA-Z0-9_-]{5,20}$', username):
            return http.HttpResponseForbidden('请输入5-20个字符的用户名')
        if not re.match(r'^[a-zA-Z0-9_-]{8,20}$', password):
            return http.HttpResponseForbidden('请输入8-20位的密码')
        if password != password2:
            return http.HttpResponseForbidden('两次输入的密码不一致')
        if not re.match(r'^1[3-9]\d{9}$', mobile):
            return http.HttpResponseForbidden('请输入正确的手机号码')
        if allow != "on":
            return http.HttpResponseForbidden('请勾选用户协议')

        try:
            user = User.objects.create_user(username=username, password=password, mobile=mobile)
        except DatabaseError:
            return render(request, "register.html", {'register_errmsg': "注册失败"})  # 错误提示信息

        login(request, user, backend=None)

        return redirect(reverse('contents:index'))


